Hydraulic hoist lever



R.V E. SMITH HYDRAULIC HOIST I JEVEIZIv CONSTRUCTION 5 Sheets-Sheet 1 Original Filed 001;.` 9. 1931 RALPH ESMITH,

June 16, 1936. R, E. sMl-TH HYDRAULIC HOIST LEVER CONSTRUCTION Original Filed Oct. 9, 19.31y 5 Sheets-Sheet 2 RALPH :.sMvlTH, j

June 16, 1936- v R. E. SMITH R@ 20,013

HYDRAULIC HOIST LEVER CONSTRUCTION Original Filed Occ. 9, 1931 3 Sheets-Sheet 3 Anniv: Y!

Reissuecl June 16, 1936 HYDRAULIC HOIST LEVER CONSTRUCTION Ralph E. Smith, Galion, Ohio, assignor to The Galion Metallic Vault Company, Galion, Ohio, a corporation of Ohio Original No. 1,973,668, dated September 11, 1934,

Serial No. 567,915, October 9, 1931. Application for reissue February 27, 1936, Serial No.

13 Claims. (Cl. 298-22) This invention relates to improvements in hoists generally, and more particularly to hoists adapted to be used in connection with dump dump truck, but this mechanism may be used for other purposes.

The numeral I is used to designate side bars bodies. It is particularly the object of this inof a frame supported on the truck, and forming vention to provide a hoist in which the applicaa part of a housing for containing the dumping 5 tion of power is along a straight line of thrust mechanism. These side bars are connected at and acts upon a system of levers for hoisting each end by means of angle irons 2. Supported some objects, among which may be a dump body on the side bars and the frame formed thereof a truck. by is a dump body 3, which has on each side It is also an object of this invention to provide and on the bottom thereof a side bar 4. These l0 an elevating mechanism contained within the side bars with the side bars I form acomplete supported frames forming a part o1' the struchousing and casing for the dumping mechanism,

ture which constitutes the support and also a and conceal and protect the same when the body part of the object to be elevated. is in horizontal position as shown in Figure l.

It is also an object of this invention to pro- In position as shown in Figure l, the dumping 15 vide a. straight line thrust which operates upon body rests on top of side bars I. Adjacent the a system of levers, whereby there is a compound rear end of the body and attached to the side result, consisting of simple lever action and a bars 4 are brackets 5, one on each side. These toggle action. brackets are V-shaped, and have at their lower It is also an object of this invention to apply ends holes through which a shaft 6 extends. 20 the lifting force to a. truck body well in advance This Shaft is Supported in the side bars I of o1 the center of gravity of the body, while at the frame. the same time permitting the pivoting of the body At each side of the frame, below the shaft 6 at the rear thereof and at the rear of the side and Supported 0n the side bar I and a bracket frame so as to permit of maximum vertical ele- Ia, is a shaft 1 which has attached adjacent its 25 vation of the body with the engaging of the inner end thereof, one end of each of a pair frame, while at the same time applying the liftof links 8. The lother ends of these links are ing force in advance of the center of gravity attached by means of a suitable pivot 9 to one of the bodyend of a link I0 and to one end of a link I2.

These and other advantages will appear from The other end of the link I0 is pivoted between 30 the following description taken in connection a pair of bars 4 at DOllt The bars 4' are with the drawings, in which there is showna'preattached '00 the bOdy frame between the Side fen-ed embodiment of the invention, bars II. yThe other end of link I2 is pivoted to In the drawings: one end of a shaft I3.

Figure 1 1s a, side elevation of 9, truck frame There are two sets of these two-lever mecha- 35 with the dump body mounted thereon, showing nlsms, one on each side of the body, and are in dotted lines the dumping mechanism. similarly operated and both connected to the Figure 2 is a longitudinally inverted section shaft I3 so that whenever this shaft I3 moves through part of the dump body and part of the the lever mechanism is operated to dump or 40 supporting frame, showing the dumping meehalower the body. On each end of the shaft is 40 mism, a hook I 3a, engaging the trackway to hold the Figure 3 is a side elevation of the dump body 1'01161 thereon. in dumping position, and showing the mechanism Adjacent each link l2, 0n its PVO? Shaft |3, for positioning the dump body in dumping posiis a, roller I4 on the shaft I3. In order to suption. port these rollers, a trackway I5 is provided for 45 Figure 4 is a top plan view with parts removed each roller. These trackways are slightly into show the dumping mechanism, clined downward toward the front of the body Figure 5 is a, section on the line 5 5 of Fig.. and supported at each end by means of a cross ure 2. beam I6. Each bracket Ia is supported at Figure 6 shows one end ofthe piston rod shaft its lower end by the Shaft 1. while its upper 50 with the hook thereon engaging beneath part end is welded to a trackway I5. The lower end of the trackway supporting that end of the 0f each bracket Ia is braced by a beam I5a at- Shaf1; tached to one end of the shaft 1 at a bracket la,

In the present instance, the hydraulic hoist; while its other end is welded to a trackway. mechanism is shown used in connection with a F01 Operating the Shaft I3 and the link mech- 55 anisms, there is provided a piston rod I1 attached at one end to the central part of the shaft I3, while its other end extends into a cylinder I9 and has thereon a piston I8 working within the cylinder. The cylinder is supported in an inclined position at one en-d by one of the beams I6, and at the other end by means of a beam 20. The cylinder is so positioned that when the ,y

piston and the piston rod move thereon, they move in line with the trackways I5, with the outer end of the piston rod I'I supported on the trackways by means of the shaft I3 and the rollers on the end thereof.

Adjacent the lower end of the cylinder is a valve casing 2 I, which has thereon a valve mechanism for controlling the admission of some hydraulic means into and from the cylinder for purposes of operating the piston and piston rod. From the valve casing, leading into the cylinder, is an inlet 22. This inlet leads into the lower end of the cylinder, While there extends from the rear end of the cylinder an outlet pipe 23. This outlet pipe extends from the rear end of the cylinder to the valve casing so that water or oil, or any other material used for operating the piston, may escape from the rear end back to the valve casing.

There is provided in the piston a passageway adapted tc be closed by means of a valve 24, which has a stem 25 extending through the opening. In 'order to hold this valve 24 normally closed, there is provided a spring 26, around the stem and between the piston and the suitable stock member on the end of the valve stem. There is also provided a dumping gauge stop 21.

A pump, such as is indicated by the numeral 28, may be used for applying hydraulic pressure to the cylinder for operating the piston and piston rod therein.

In Figure 1, the dump body is shown in horizontal position supported on top of the truck frame, which may be considered a. support.v In order to causethe body to be hoisted for dumping purposes, a liquid of some kind is forced into the lower end of the cylinder against the piston so that the piston is advanced toward the upper end of the cylinder, carrying with it the piston rod and shaft I3. This causes the links I2 to move toward the rear, thereby bringing the links 8 and I0 more nearly in line with each other and elevating at the same time these links from a position such as shown in Figures 1 and 2 to a position shown in Figure 3. This action of the piston I'I on the links I2 has both a simple lever action and also a toggle action. It is to be observed that the shaft for operating the links I2 always moves in a single plane so that there is a direct application of power along one line.

I desire to comprehend withinl my invention such modifications as may be embraced within my claims and the scope of my invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a hoist, in combination with a supporting member and an object to be hoisted, a system of links attached to the supporting member and to the object to be hoisted, a trackway on the supporting member, and means to operate the links to elevate said object, said means including a cylinder, a piston and piston rod, and rollers on the piston rod engaging the trackway and guided thereby.

2. In a hoist, in combination with the supporting member and an object to be hoisted, a pair of links attached to each other and to the supporting member and the object to be hoisted, and means connected to the links where they are attached to each other and movable in a line substantially parallel to the links attached to the supporting member when the links are in nonhoisting positions to operate the levers to elevate the object to be hoisted.

3. In a hoist, in combination with a supporting member and an object to be hoisted, a pair of links pivoted to each other at one end and having their other ends attached to the supporting member and the object to be hoisted, respectively, a link connected at one end to one of said links, means engaging the other end of said link for operating said link, and stationary means to guide` the last-named means in a straight line substantially parallel to the first lever when the body is in non-dumping Position.

4. In a hoist, in combination with a supporting member and an object to be hoisted, a pair of links pivoted to each other at one end and having the other end of one link attached to the supporting member and the other end of the other link attached to the object to'be hoisted, a link attached at one end to said links, a roller on the other end of the last-mentioned link, a stationary guide for said roller, and means to cause said roller to travel along said guide whereby the links are operated and the object to be hoisted is elevated.

5. In a hoist, in combination with the supporting member and an object to be hoisted pivoted to said supporting member, a pair of links pivoted at one end to each other and having the other end of one link pivoted to the supporting member and the other end of. the other link pivoted to the object to be supported, a stationary trackway, a traveling member on said trackway, means connecting said links to said traveling member, and means to cause said traveling member to move on the trackway whereby the links are operated and the object hoisted.

6. In a hoist, in combination with a supporting member and an object tobe hoisted, a system of links attached to the supporting member and to the object to be hoisted, a trackway, and means movable along the trackway to operate the links to elevate said object, said means including a y shaft having rollers engaging the trackway and links connected to the first-mentioned links.

7. In a dump body, in combination with a supporting frame to which one end of the dump body is pivoted, a link pivoted at one end to said frame, a second link pivoted at one end to the dump body, means connecting the other ends of said links, a link attached to said means at one end, and means to cause the other end of said link to move in a straight line substantially parallel to the first link when the body is in nondumping position for operating the links to dump the body.

8. In a dump body, in combination with aI frame v to which one end of the body is pivoted, a link on each side of the frame pivoted at one end to the frame, a second link on each side of the dump body pivoted at one end to the dump body, means pivotally connected to the ends of said links and a link attached at one end to said last-named means, and means engaging the other end of the last-named link to cause it to travel in a straight line substantially parallel to the first link when the body is in non-dumping position, whereby the links are operated and the body dumped.

9. In a hoisting apparatus, a supporting frame, a body, a pair of links on each side of the frame, one end of each link of one pair of links attached to o-ne side of the frame and one end o-f each of the links of the other pair of links being attached to the other side of the frame, a single link attached at one end to each sideof the body, the other ends of each single link being attached to the free ends of one pair of links, and means acting in a plane substantially parallel to the pairs of links when the body is in non-dumping position to operate all of said links. v

10. In a hoisting apparatus, a supporting frame, a body, a pair of links on each side of the frame, one end of each link of one pair of links being attached to one side of the frame and one end of each of the links of the other pair of links being attached to the other side of the frame, a single link on each side of the body attached at one end to the body, pivots by which the other ends of all the links are connected, a trackway on the frame, and means movable on the trackway connected to the pivots for operating the links to hoist the body.

l1. In a hoisting apparatus, a supporting frame, a body, a pair of links on each side of the frame, one end of each link of one pair of links being attached to one side of the frame and one end of each of the links of the other pair of links being attached to the other side of the frame, a

single link on each side o1' the body attached at one end to the body, pivots by which the other ends of all the links are connected, a trackway on the frame, and means movable on the track- Way connected to the pivots for operating the links to hoist the body, said means including a shaft having rollers engaging the trackway.

12. In a hoisting apparatus, a suppo-rting frame, a body, a pair o-f links on each side of the frame, one end of each link of one pair of links being attached to one side of the frame and one end of each of the links of the other pair of links being attached to the other side of the frame, a link on each side of the body attached at one end to the body, pivots by which the other ends of all the links are connected, a traokway on the frame, a shaft having rollers on said trackwa-y, links connecting said shaft and pivots, and means to move said shaft and rollers along the trackway to operate the links, whereby the body is hoisted.

13. In a hoist, in combination with a supporting member and an object to be hoisted, link means attached to the supporting member and to the object to be hoisted, a trackway on the supporting member, and means to operate the link means to yelevate said object, said means to operate said link means including a cylinder, a piston and piston rod, and rollers on the piston rod engaging the trackway and guided thereby.

RALPH E. SMITH. 

